* @throws FactoryException if the CRS can't be created.
*/
private EngineeringCRS createEngineeringCRS(final boolean target) throws FactoryException {
final Map<String,Object> properties = new HashMap<String,Object>(4);
properties.put(CoordinateReferenceSystem.NAME_KEY, Vocabulary.format(VocabularyKeys.UNKNOWN));
final GeographicExtent validArea = getValidArea(target);
if (validArea != null) {
final ExtentImpl extent = new ExtentImpl();
extent.getGeographicElements().add(validArea);
properties.put(CoordinateReferenceSystem.DOMAIN_OF_VALIDITY_KEY, extent.unmodifiable());
}